Community Broadcast Tool
Community Broadcast Tool is a proposal for a MediaWiki extension that provides the possibility to inform Wiki users, with different topics (or streams) that users individually and globally can Opt-in and Opt-out to. It is intended to work together with CentralNotice and maybe replace some of the use of CentralNotices.
Whether users are informed via banners or a different system, is still an open question. So whether this just makes it possible for users who find banners to opt out, or whether this actually changes the way information is transported, has to be discussed.